Razza,
As a reasonably low-hours pilot I noticed that my pre-landing checks were getting a bit sloppy, but that all cleared up when I started saying them out loud again. It seems that the act of talking kept me focussed on what I was doing, so now I always speak 'em out, regardless of who is with me.
I had a funny reaction from a mate who I took on a quick trip to Goulburn and back. I guess he was expecting it to me like a car on a freeway - press the cruise control, point the nose and sit back - and he said afterwards "It didn't seem very relaxed; you were pretty busy". The constant scan, scan, scan, check inside, navigate, pause conversation to listen to radio calls, etc wasn't at all what he expected a flight to be.